Tempering-furnace arrangement.



J. B. NAU. TBMPBRING PURNAGE ARRANGBMBNT.

APPLIOATION FILED 00T. 15, 1908.

Patented'Mar. 30, 1909.

Wllii N l/wE/vron the".

JOHN'B. NAU, OF NEW YORK, N. Y.

TEMPERING-FURNACE ARRANGEMENT.

Specication of Letters Patent.

Patented March 30, 1909.

Application aieaocwberia 190s. serai No. 457,869.

To all'wiom it may concernkBe 1t known that I, JOHN B NAU, citizen -of the United States, and -resident of New York city, in the county of .New York and -Sftat'e of New York, have invented certain Vriet'vcand useful Improvements in Tempering- Arrangements, of which the follow- ;specication.

l vention relates more particularly to Vanner of heating furnaces of the style used in the process of hardening and tempermg Wire or similar products, in which process the products to be treated are run through a bath of ymolten lead contained in a pot placed inside a furnace, which latter, for convenience sake, I call hardening furnace, then through a hardening liquid, and then again thro'u h a. second bath of molten lead con-4 ta' in a pot that forms practically the top of a .tempering furnace.

The invent'cn may also find application in any method or process, where, during the successive operations to which the objects to be treated are submitted, they may have4 to obtained by burning the said remaining unconsumed gases with a fresh supply o ,air,

'are utilized to heat the said second furnace,

before allowing the brases yto escape from it. It is obvious that the number of furnaces thus heated on the aforesaid principle need not be. limited to two, but a succession of three or more furnaces can' be heated by leadin the products of combustion successively om for instance the first to the second, from the second to the third, etc., and thus heat each furnacein turn in the manner hereinafter described, before letting the waste gases escape from the last furnace.

The annexed drawings and the following description set forth certain means embodying the invention, such disclosed means constituting'but .one of various forms 1n which 'the principle of the invention may be used.

. In said annexed drawings, Figure I is av vertical cross section on line I I of Fig. II.; F' II. is a plan view on line II II of ig I lIeferring to these drawings :-1 represents the hardening furnace. with side walls 2, end-walls 3, combustion chamber Ll, gas inlet ports 5 located in the side walls, air inlet opening 6, bridge wall 7 and return fine S 9 is a melting pot made of cast iron or anr other suitable material, resting with its. ends on the end walls and` placed inside the furnace, where during the operation it is surrounded With flame. An; other support may be su plied to uphold this pot in anyY point of its ength.

1() is a flue connecting furnace 1 with furn nace 11'. Furnace 11 has side walls 12, end wallsl 13, bridge wall 15, combustion chainber- 16, air inlet openings 17 regulated by damper 18, dam er 20 controlling a by-pass flue 19 that lea s to smoke flue 21, another damper 22 controlling waste gas flue 23, through which the spent gases reach smoke flue 21.

A lead melting pot 24 forms the roof of the furnace.

Z5 is the opening of a flue through which as can be admitted to line 10 should it be ound necessary to admit more gas to furnace 11.

Resting'on piers 27 between the two furnaces is placed a tank 26 containing oil or any other hardening liquid.

The wire to be treated is run from left to right in the way shown by the heavy brken line indicated in Fig. I in the direction from hardening furnace to tempering furnace. i

The operation of heating will be done as follows: The gas admitted through the gas Orts into the hardening furnace will. be

urned in said furnace, the flame surrounding the lead pot will melt and heat the lead, the products of combustion with the still unconsumed gases will be evacuated through flue 8, will pass through flue 10 and enter the tem ering furnace. Here a suitable su ply ci) air will be admitted to burn the sti l unconsumed gases contained in the mixture coming from the hardening furnace, after which the gases after having passed under pot 24, will be evacuated from said tempering furnace and enter smoke flue 21. Should it be desirable to prevent the gases from passing all under pot 24, dam er 20 may be pulled open artly or entire y and l much gas will enter irectly smoke flue 21 through 'byass 19. This by-pass may be omitted. en leaving furnace 11, the

ases instead of entering the smoke flue, may

e further taken through a 'flue similar to flue 10 to a third furnace, said third furnace being again heated in the manner described to heat furnace 1l o f the drawings.

For simplicitys sake I have not shown a third furnace, as it was deemed that the principle employed was suiiiciently illustrated in its application to the two furnaces shown on the drawings.

In the application of the heating principle heretofore described, do not limit myself to introducing Athe air into 4the tempering furnace at or near the point 17 shown on the drawings. lt may be found more convenient to introduce this air at any suitable location in flue 10, whereby the unburned gas coming from the hardening furnace would start burning before reachingv the combustion chamber 16 of said tempering furnace. This would in no way alter the Vrinciple employed but at times it might he p to obtain a lower temperature under pot 24 should a somewhat lower temperature be necessary. In flue 1() I may also use checkerwork for the purpose of storing away some of the heat coming from the hardening furnace.. As such checkerwork is well known to those acquainted with furnace practice, l have not deemed it necessary to show it on the drawing, thus avoiding complication.

l claim as my invention and wish to secure Vby Letters Patent:

l. The method of jointly heating a harde ningN furnace and a vtempering furnace, which method consists in burning fuel in said hardening furnace7 leading the' mixture of the products of combustion and remaining combustibles from said hardening furnace to said tempering furnace, heating said tempering furnace by means of the heat derived from said products of combustion and from the combustion of said remaining combustibles.

2. The'y method of jointly heating by gas a hardening furnace and a temperingfurnace, which method consists in burning `gas in said hardening furnace, leading the mixture of the produc-ts of combustion and reinaining unburned gases from said hardening furnace to said tempering furnaceI heating said tempering furnace by means of rived from said products of combustion and from the combustion of said remaining uriburned gases.4

3. The method of jointly heating'a hardening furnace and a tempering furnace,

v'which method consists in burning a combustible in one of said furnaces, leading the mixture of products of combustion and remaining unconsumed combustible from the said one furnace to the other one of said furnaces and heat this said other furnaceby means of the heat derived from said products of combustion and fro'm the combustion of said unconsumed combustibles.

4. In combination, a hardening furnace, a

tempering furnace, a flue connecting said hardening furnace with said tempering furnace for thepurpose of carrying the products of combustion and the remaining combustibles from one of said. furnaces lto the other one of said furnaces.

- 5. In combination, a hardeningy furnace having gas inlet device and airinlet device, a tempering furnace with air inlet device, a.

flue leading from said hardening furnace 'to-.1 said tempering furnace, and a waste gas liuc,

leasding from said tempering furnace.

New York and State of New York this fourteenth day of October A D. 1908.

' JOHN B. NAU.

Witnesses:

DAVID GRANT, JOHN BUCKRIDGE.

the heat de-V gned at New York city in thecounty off' 

